SDL_UnlockSurface(s);
}
+SDL_Surface *
+load_image(char *filename)
+{
+ SDL_Surface *tmp, *img = NULL;
+ char *s = add_data_path(filename);
+ if(s) {
+ tmp = IMG_Load(s);
+ free(s);
+ if(tmp) {
+ img = SDL_DisplayFormat(tmp);
+ SDL_FreeSurface(tmp);
+ }
+ }
+ return img;
+}
+
int
init(void) {
int i;
- SDL_Surface *temp;
+ char *s;
Uint32 flag;
// Where are our data files?
}
// Load the banners
- NULLERROR(temp = IMG_Load(add_path("banners/variations.png")));
- NULLERROR(surf_b_variations = SDL_DisplayFormat(temp));
+ NULLERROR(surf_b_variations = load_image("banners/variations.png"));
+ NULLERROR(surf_b_on = load_image("banners/on.png"));
+ NULLERROR(surf_b_rockdodger = load_image("banners/rockdodger.png"));
- NULLERROR(temp = IMG_Load(add_path("banners/on.png")));
- NULLERROR(surf_b_on = SDL_DisplayFormat(temp));
-
- NULLERROR(temp = IMG_Load(add_path("banners/rockdodger.png")));
- NULLERROR(surf_b_rockdodger = SDL_DisplayFormat(temp));
-
- NULLERROR(temp = IMG_Load(add_path("banners/game.png")));
- NULLERROR(surf_b_game = SDL_DisplayFormat(temp));
-
- NULLERROR(temp = IMG_Load(add_path("banners/over.png")));
- NULLERROR(surf_b_over = SDL_DisplayFormat(temp));
-
- surf_font_big = IMG_Load(add_path(BIG_FONT_FILE));
- g_font = SFont_InitFont(surf_font_big);
+ NULLERROR(surf_b_game = load_image("banners/game.png"));
+ NULLERROR(surf_b_over = load_image("banners/over.png"));
// Load the spaceship graphic.
- NULLERROR(temp = IMG_Load(add_path("sprites/ship.png")));
- NULLERROR(surf_ship = SDL_DisplayFormat(temp));
+ NULLERROR(surf_ship = load_image("sprites/ship.png"));
get_shape(surf_ship, &shipshape);
// Load the life indicator (small ship) graphic.
- NULLERROR(temp = IMG_Load(add_path("indicators/life.png")));
- NULLERROR(surf_life = SDL_DisplayFormat(temp));
+ NULLERROR(surf_life = load_image("indicators/life.png"));
+
+ // Load the font image
+ s = add_data_path(BIG_FONT_FILE);
+ if(s) {
+ NULLERROR(surf_font_big = IMG_Load(s));
+ free(s);
+ g_font = SFont_InitFont(surf_font_big);
+ }
init_engine_dots();
init_dust();
int
gameloop() {
- Uint8 *keystate;
+ Uint8 *keystate = SDL_GetKeyState(NULL);
float tmp;
#include "rocks.h"
#include "shape.h"
+SDL_Surface *load_image(char *filename);
+
struct rock_struct {
struct rock_struct *next;
float x,y,dx,dy;
struct rock_struct rocks[MAXROCKS], *free_rocks;
struct rock_struct **rock_buckets[2];
-int n_buckets, p;
+int n_buckets;
+// we have two sets of buckets -- this variable tells which we are using.
+int p;
int bw, bh;
int grid_size;
float nrocks_inc_ticks = 2*60*20/(F_ROCKS-I_ROCKS);
// constants for rock generation.
-#define KH (32.0*20) // 32 s for a speed=1 rock to cross the screen horizontally.
-#define KV (24.0*20) // 24 s for a speed=1 rock to cross the screen vertically.
+#define KH (32*20) // 32 s for a speed=1 rock to cross the screen horizontally.
+#define KV (24*20) // 24 s for a speed=1 rock to cross the screen vertically.
#define RDX 2.5 // range for rock dx values (+/-)
#define RDY 2.5 // range for rock dy values (+/-)
-static inline int bucket(int x, int y) { return (1+x/grid_size) + bw*(1+y/grid_size); }
+static inline struct rock_struct **
+bucket(int x, int y, int p)
+{
+ int b = (1+x/grid_size) + bw*(1+y/grid_size);
+ return &rock_buckets[p][b];
+}
void
init_buckets(void)
}
void
-sort_rock(struct rock_struct *q, struct rock_struct *r, int p)
+transfer_rock(struct rock_struct *r, struct rock_struct **from, struct rock_struct **to)
{
- int b = bucket(r->x, r->y);
- q->next = r->next; // remove from old list
- r->next = rock_buckets[p][b]; // insert into new list
- rock_buckets[p][b] = r;
+ *from = r->next;
+ r->next = *to;
+ *to = r;
}
void
nrocks_timer = 0;
}
+#define ROCK_LEN sizeof("sprites/rockXX.png")
+
int
init_rocks(void)
{
int i;
- char a[MAX_PATH_LEN];
- SDL_Surface *temp;
+ char a[ROCK_LEN];
int maxw=0, maxh=0;
for(i = 0; i<NROCKS; i++) {
- snprintf(a,MAX_PATH_LEN,add_path("sprites/rock%02d.png"),i);
- NULLERROR(temp = IMG_Load(a));
- NULLERROR(surf_rock[i] = SDL_DisplayFormat(temp));
+ snprintf(a, ROCK_LEN, "sprites/rock%02d.png", i);
+ NULLERROR(surf_rock[i] = load_image(a));
get_shape(surf_rock[i], &rock_shapes[i]);
maxw = max(maxw, rock_shapes[i].w);
maxh = max(maxh, rock_shapes[i].h);
r->dy = weighted_rnd_range(rmin[i], rmax[i]) + screendy;
break;
}
- sort_rock((struct rock_struct *)&free_rocks, r, p);
+ transfer_rock(r, &free_rocks, bucket(r->x, r->y, p));
}
}
}
move_rocks(void)
{
int b;
- struct rock_struct *q,*r;
+ struct rock_struct **head;
+ struct rock_struct *r;
// Move all the rocks
for(b=0; b<n_buckets; b++) {
- q=(struct rock_struct *)&rock_buckets[p][b]; r=q->next;
- while(r) {
+ head=&rock_buckets[p][b]; r=*head;
+ while(*head) {
+ r=*head;
+
// move
r->x += (r->dx - screendx)*t_frame;
r->y += (r->dy - screendy)*t_frame;
- // clip
+ // clip or resort into other bucket set
+ // (either way we move it out of this list).
if(r->x + r->image->w < 0 || r->x >= XSIZE
|| r->y + r->image->h < 0 || r->y >= YSIZE) {
- q->next = r->next;
- r->next = free_rocks; free_rocks = r;
+ transfer_rock(r, head, &free_rocks);
r->image = NULL;
- } else sort_rock(q,r,1-p);
- if(q->next == r) q = q->next;
- if(q) r = q->next; else r = NULL;
+ } else transfer_rock(r, head, bucket(r->x, r->y, 1-p));
}
}
p = 1-p; // switch current set of buckets.
}
int
-hit_in_bucket(int b, float x, float y, struct shape *shape)
+hit_in_bucket(struct rock_struct *r, float x, float y, struct shape *shape)
{
- struct rock_struct *r;
-
- for(r=rock_buckets[p][b]; r; r=r->next) {
+ for(; r; r=r->next) {
if(collide(x - r->x, y - r->y, r->shape, shape)) return 1;
}
return 0;
int
hit_rocks(float x, float y, struct shape *shape)
{
- int b = bucket(x, y);
+ struct rock_struct **b = bucket(x, y, p);
int bdx = ((int)x+shape->w)/grid_size - (int)x/grid_size;
int bdy = ((int)y+shape->h)/grid_size - (int)y/grid_size;
- if(hit_in_bucket(b, x, y, shape)) return 1;
- if(hit_in_bucket(b-1, x, y, shape)) return 1;
- if(hit_in_bucket(b-bw, x, y, shape)) return 1;
- if(hit_in_bucket(b-bw-1, x, y, shape)) return 1;
+ if(hit_in_bucket(*b, x, y, shape)) return 1;
+ if(hit_in_bucket(*(b-1), x, y, shape)) return 1;
+ if(hit_in_bucket(*(b-bw), x, y, shape)) return 1;
+ if(hit_in_bucket(*(b-bw-1), x, y, shape)) return 1;
if(bdx) {
- if(hit_in_bucket(b+1, x, y, shape)) return 1;
- if(hit_in_bucket(b+1-bw, x, y, shape)) return 1;
+ if(hit_in_bucket(*(b+1), x, y, shape)) return 1;
+ if(hit_in_bucket(*(b+1-bw), x, y, shape)) return 1;
}
if(bdy) {
- if(hit_in_bucket(b+bw, x, y, shape)) return 1;
- if(hit_in_bucket(b+bw-1, x, y, shape)) return 1;
+ if(hit_in_bucket(*(b+bw), x, y, shape)) return 1;
+ if(hit_in_bucket(*(b+bw-1), x, y, shape)) return 1;
}
- if(bdx && bdy && hit_in_bucket(b+bw+1, x, y, shape)) return 1;
+ if(bdx && bdy && hit_in_bucket(*(b+bw+1), x, y, shape)) return 1;
return 0;
}
int
-pixel_hit_in_bucket(int b, float x, float y)
+pixel_hit_in_bucket(struct rock_struct *r, float x, float y)
{
- struct rock_struct *r;
- for(r=rock_buckets[p][b]; r; r=r->next) {
+ for(; r; r=r->next) {
if(x < r->x || y < r->y) continue;
if(pixel_collide(x - r->x, y - r->y, r->shape)) return 1;
}
int
pixel_hit_rocks(float x, float y)
{
- int b = bucket(x, y);
- if(pixel_hit_in_bucket(b, x, y)) return 1;
- if(pixel_hit_in_bucket(b-1, x, y)) return 1;
- if(pixel_hit_in_bucket(b-bw, x, y)) return 1;
- if(pixel_hit_in_bucket(b-bw-1, x, y)) return 1;
+ struct rock_struct **b = bucket(x, y, p);
+ if(pixel_hit_in_bucket(*b, x, y)) return 1;
+ if(pixel_hit_in_bucket(*(b-1), x, y)) return 1;
+ if(pixel_hit_in_bucket(*(b-bw), x, y)) return 1;
+ if(pixel_hit_in_bucket(*(b-bw-1), x, y)) return 1;
return 0;
}